190661820 has 48 divisors (see below), whose sum is σ = 535883040. Its totient is φ = 50649856.

The previous prime is 190661797. The next prime is 190661831. The reversal of 190661820 is 28166091.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10234 + ... + 22046.

It is an arithmetic number, because the mean of its divisors is an integer number (11164230).

Almost surely, 2^190661820 is an apocalyptic number.

190661820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

190661820 is an abundant number, since it is smaller than the sum of its proper divisors (345221220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

190661820 is a wasteful number, since it uses less digits than its factorization.

190661820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12094 (or 12092 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 190661820 is about 13808.0346175696. The cubic root of 190661820 is about 575.5564317476.

The spelling of 190661820 in words is "one hundred ninety million, six hundred sixty-one thousand, eight hundred twenty".